Deja reve ('already dreamed') has been hypothesized as a cause for various forms of déjà experience. With deja reve one has the distinct impression that the uncanny familiarity one is sensing has come from a preceding dream, but one not usually remembered until
the experience is taking place. In this exploratory investigation, 2,492 respondents filled out online questionnaires in which they were queried about the incidence of their deja reve experiences, about dream frequency, and about their attitudes to dreams. The Big Five personality factors
were also measured using a separate, standardized questionnaire. Nearly 80% claimed to have had such experiences and the associated frequencies are presented. Age was negatively correlated with the incidence and there was little gender dependence. The results of the Big Five personality factors
are also presented. Suggestions are made for future research.